package com.tanhua.server.service;

import cn.hutool.core.util.StrUtil;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;


@Service
public class AipContentTokenService {


    @Autowired
    private RedisTemplate<String,String> redisTemplate;

    private static final String REDIS_KEY = "ACC_TOKEN";


    /**
     * 获取token，先从redis中获取，如果没有，再去环信接口获取
     *
     * @return
     */
    public  String getToken() {
        String token = this.redisTemplate.opsForValue().get(REDIS_KEY);
        if (StrUtil.isNotEmpty(token)) {
            return token;
        }


        //访问环信接口获取token
        return this.refreshToken();
    }


    /**
     * 刷新令牌
     *
     * @return {@link String}
     */
    private String refreshToken() {
        // 获取token地址
        String authHost = "https://aip.baidubce.com/oauth/2.0/token?";
        String getAccessTokenUrl = authHost
                // 1. grant_type为固定参数
                + "grant_type=client_credentials"
                // 2. 官网获取的 API Key
                + "&client_id=" + "nGS70AgWHj9FOSMf1LnMcfKx"
                // 3. 官网获取的 Secret Key
                + "&client_secret=" + "GRdE1BLRRDfdgDhB8GroiAl0eYhlVSGA";
        try {
            URL realUrl = new URL(getAccessTokenUrl);
            // 打开和URL之间的连接
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.err.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String result = "";
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            /**
             * 返回结果示例
             */
            System.err.println("result:" + result);
            JSONObject jsonObject = new JSONObject(result);
            String access_token = jsonObject.getString("access_token");

            //如果获取的token不为空,放入redis中
            if(StrUtil.isNotEmpty(access_token)){

                //access_token有效期限是一个月  过期时间比网上到期时间提前一个小时
                long timeout = jsonObject.getLong("expires_in") - 3600;
                redisTemplate.opsForValue().set(REDIS_KEY,access_token,timeout, TimeUnit.SECONDS);
            }

            return access_token;
        } catch (Exception e) {
            System.err.printf("获取token失败！");
            e.printStackTrace(System.err);
        }
        return null;

    }

}
